Retinal Vessel Diameter Measurement Using Unsupervised Linear Discriminant Analysis

Table 3

Comparison of vessel diameter measurement accuracy and precision between the proposed ULDM, established techniques, and manual measurement for the VDIS database^a.

VDIS database
Method name	Success rate (%)	Diameter		Difference
		Average 𝜇1	SD 𝜎1	Average 𝜇2	SD 𝜎2
Observer 1	100	8.50	2.54	−0.35	0.543
Observer 2	100	8.91	2.69	0.06	0.621
Observer 3	100	9.15	2.67	0.30	0.669
HHFW	78.4	7.94	—	−0.91	0.879
1D Gaussian	99.9	5.78	—	−3.07	2.110
2D Gaussian	77.2	6.59	—	−2.26	1.328
ESP method	99.6	8.80	—	−0.05	0.766
Graph-based method	96.0	8.35	3.00	−0.53	1.43
Proposed ULDM	96.3	8.68	2.82	−0.64	1.18